If you own a Tacoma, 4Runner or FJ Cruiser built in the last twenty years, there is a good chance a 1GR-FE is under the hood. It took over from the 3.4L 5VZ and powered Toyota's mid-size 4x4s for two decades, the 4Runner all the way to 2024, with very few headlines. That is the best thing you can say about a truck engine.
This guide covers the specs, every US application, the difference between single and dual VVT-i, what actually goes wrong (and a few problems that get blamed on the 1GR but belong to other engines), maintenance intervals, and the forced-induction options.
1GR-FE Specs at a Glance
| SPEC | 1GR-FE |
|---|---|
| Layout | 60° V6, DOHC, 24 valves |
| Displacement | 3,956cc (4.0L) |
| Bore x stroke | 94.0 x 95.0mm |
| Compression ratio | 10.0:1 (single VVT-i) / 10.4:1 (dual VVT-i) |
| Block | Aluminum, open deck, thin cast-in iron liners |
| Heads | Aluminum, 4 valves per cylinder |
| Timing drive | Chain (primary chain plus secondary cam chains) |
| Firing order | 1-2-3-4-5-6 |
| Valvetrain | Shimless buckets (single VVT-i) / roller rockers with hydraulic lash adjusters (dual VVT-i) |
| Coolant | Toyota Super Long Life (pink, pre-mixed) |
| Redline | About 6,200 rpm (owner and tuner reported) |
One thing to know about the block: the iron cylinder liners are thin and cast into the aluminum, and they cannot be bored oversize. A badly scored cylinder means a replacement block or short block, not a machine-shop overbore like an old 22R. Keep the oil clean and the cooling system healthy and this rarely matters.
Interference or not? Toyota does not publish it and owner sources disagree. Because the 1GR uses a chain instead of a belt, it is mostly an academic question: chain failures on this engine are rare and usually show up as noise long before anything lets go.
Power & Torque by Vehicle
Toyota changed the way it rated horsepower for 2006 (the SAE J1349 revision). The engine did not lose power; the numbers on paper went down. That is why a 2005 Tacoma is listed at 245 hp and a 2006 at 236 hp with the same hardware.
| VEHICLE | YEARS | VVT-i | HORSEPOWER | TORQUE |
|---|---|---|---|---|
| 4Runner (4th gen) | 2003–2005 | Single | 245 hp @ 5,200 | 282 lb-ft @ 3,800 |
| 4Runner (4th gen) | 2006–2009 | Single | 236 hp @ 5,200 | 266 lb-ft @ 4,000 |
| Tacoma (2nd gen) | 2005 | Single | 245 hp | 282 lb-ft |
| Tacoma (2nd gen) | 2006–2015 | Single | 236 hp @ 5,200 | 266 lb-ft @ 4,000 |
| Tundra V6 | 2005–2006 | Single | 245 hp | 282 lb-ft |
| Tundra V6 | 2007–2009 | Single | 236 hp @ 5,200 | 266 lb-ft @ 4,000 |
| FJ Cruiser | 2007–2009 | Single | 239 hp @ 5,200 (premium fuel) | 278 lb-ft @ 3,700 |
| FJ Cruiser | 2010–2014 | Dual | 258 hp (regular fuel) | 270 lb-ft |
| 4Runner (5th gen) | 2010–2024 | Dual | 270 hp | 278 lb-ft |
Not on the list: the US-market Lexus GX never used the 1GR. The GX470 had the 4.7L 2UZ-FE V8 and the GX460 the 4.6L 1UR-FE V8. Outside the US the 1GR also powered the Land Cruiser Prado and the Hilux.
The Tacoma never got dual VVT-i. Every 2005–2015 Tacoma V6 is a single VVT-i 1GR-FE. 2012 and later Tacomas did gain a secondary air injection system for emissions, which matters for the problems section below.
Single VVT-i vs Dual VVT-i: What Changed in 2010
| SPEC | SINGLE VVT-i | DUAL VVT-i |
|---|---|---|
| Found in | 2003–2009 4Runner, 2005–2015 Tacoma, 2007–2009 FJ, Tundra V6 | 2010–2024 4Runner, 2010–2014 FJ |
| Cam timing | Intake cam only (about 50° range) | Intake (40°) and exhaust (35°) |
| Compression | 10.0:1 | 10.4:1 |
| Valvetrain | Shimless buckets, valve lash checked every 60k | Roller rockers, hydraulic adjusters, no lash service |
| Spark plugs | Nickel, 30k-mile interval (per Toyota's Tacoma schedule) | Iridium, 120k-mile interval |
| Oil filter location | Original location | Moved to a separate bracket under the engine |
| Secondary air injection | No (except 2012+ Tacoma) | Yes |
| Power | 236–245 hp | 258–270 hp |
The dual VVT-i update was more than a cam phaser. Toyota also fitted lighter pistons, a lighter crankshaft (five counterweights instead of nine), a water jacket spacer for more even cylinder temperatures, and higher fuel pressure for ethanol blends. On the road, the dual VVT-i trucks pull noticeably harder up top and the FJ moved from premium to regular fuel.
Why this matters when you buy parts: superchargers, cam-related parts and some intake parts are specific to "roller rocker" (dual VVT-i) or "non roller rocker" (single VVT-i) engines. Toyota's own TRD parts are labeled this way. Know which one you have before you order.
Known Problems: Real vs Myth
Front timing cover oil leak (real, early trucks)
Toyota documented an oil leak at the junction of the bank 1 cylinder head, the block and the front timing cover on 2003–2007 4Runners and early 2007 FJ Cruisers built before a production change. The fix is resealing the cover. If you are shopping for an early 4th gen 4Runner, look for oil on the passenger side front of the engine and ask whether the cover has been resealed.
Head gasket seepage (real, uncommon)
The 1GR's multi-layer steel head gasket can seep at high mileage, most often reported at the rear cylinders. Symptoms are slow coolant loss with no visible leak, bubbles or exhaust smell in the coolant reservoir, and eventually overheating. It is not common (a small percentage of engines) and is rarely seen before about 100,000 km. A neglected cooling system makes it worse. There is no credible evidence tying it to a particular early model year.
Buyer's check: a block test (combustion gas in the coolant) costs a few dollars and takes five minutes. Do it on any high-mileage 1GR you are thinking about buying.
Secondary air injection pump & valves (real, later trucks)
2010+ dual VVT-i 4Runners and FJs, and 2012+ Tacomas, use an air pump to clean up cold-start emissions. The pump lives low in the fender area, water gets in, and the pump or its switching valves fail. You will see codes like P2440, P2442, P2443 or P2445, sometimes with the truck dropping into limp mode. Toyota's 10-year/150,000-mile air injection warranty extension that people often mention covers 2007–2010 Tundra and 2008–2010 Sequoia V8s, not the 1GR, so expect to pay for this one.
Water pump seepage (wear item)
Water pumps eventually weep on any engine. Plenty of 1GR pumps go well past 150,000 miles. If you are doing other work at the front of the engine on a high-mileage truck, consider it cheap insurance.
Ticking noise (usually normal)
A light tick from the top of the engine is usually injector or EVAP purge valve noise, which is normal. On single VVT-i engines, a louder tick can be valve lash out of spec, which is why Toyota calls for a lash check every 60,000 miles on those engines.
Ignition coils (occasional)
Coils fail occasionally, mostly on pre-2009 engines around 100,000 miles. A misfire code on one cylinder, swap the coil to another cylinder, and see if the code follows.
Myth: the "VVT-i oil line" rupture
The rubber-section oil line that could burst and dump oil is a 2GR-FE (3.5L V6) issue, found in cars like the Camry, Avalon and RAV4. The 1GR does not have that line. If a seller or shop brings it up on a Tacoma or 4Runner 4.0, they are thinking of the wrong engine. For the 3.5L V6 that replaced the 1GR in the Tacoma, see our 2GR-FKS problems guide.
Maintenance Intervals That Matter
| ITEM | SINGLE VVT-i | DUAL VVT-i |
|---|---|---|
| Engine oil | 5,000 mi / 6 mo (older schedules) | Follow your owner's manual; many owners run 5,000 on trucks that tow or wheel |
| Oil viscosity | 5W-30 on most older trucks | 0W-20 (5th gen 4Runner) |
| Spark plugs | 30,000 mi (nickel) | 120,000 mi (iridium) |
| Valve clearance | Inspect at 60,000 mi, then every 60k | Not required |
| Coolant (SLLC) | 100,000 mi first, then every 50,000 | Same |
| Drive belt | Inspect at 60,000, then every 15,000 | Same |
Always confirm oil capacity and viscosity against your owner's manual or oil cap. As a rough guide, owners report about 5.5 quarts with filter on the 2nd gen Tacoma and 4th gen 4Runner and about 6.6 quarts on the 2010+ 4Runner.
About those spark plugs: a lot of guides say "120k plugs" for every 1GR. That is only true for the iridium plugs in dual VVT-i engines. Toyota's own maintenance guide for the 2008 Tacoma lists plug replacement on the 1GR every 30,000 miles.
Upgrades: Superchargers, Tunes & Intakes
The 1GR responds well to boost because the bottom end is stout and compression is moderate.
| UPGRADE | FITS | RATED OUTPUT | NOTES |
|---|---|---|---|
| TRD supercharger (PTR29-35120) | Single VVT-i: 2003–2009 4Runner, 2005–2015 Tacoma, 2007–2009 FJ | 304 hp / 334 lb-ft | Eaton roots blower with air-to-water intercooler. Discontinued; used kits sell fast. |
| Magnuson MP90 | Single VVT-i Tacoma and FJ | About 305 hp / 335 lb-ft at 6 psi | CARB-legal (EO D-488-40). |
| Magnuson TVS1320 | Dual VVT-i: 2010–2019 4Runner, 2010–2014 FJ | 335+ hp / 345+ lb-ft at about 6 psi | CARB-legal (EO D-488-45). A separate kit covers 2020+ 4Runner. |
| ECU tune (OTT / EcuTek-based) | Single and dual VVT-i | Varies | Mostly drivability, shift and rev-limit changes; meaningful with a blower. |
| Cold air intake | All | Minimal | Sound and throttle response more than horsepower. |
TRD announced a roller-rocker supercharger for the dual VVT-i 4Runner and FJ but it does not appear to have reached the market, and Magnuson filled that gap. If you are looking at boost on a 3rd gen Tacoma instead, that truck runs a different engine; see our Magnuson supercharger Tacoma build guide.
Bigger tires change the math. A 4.0 that feels strong on stock tires feels flat on 35s. Before spending supercharger money, look at gearing. Our fitment guides for the FJ Cruiser, 5th gen 4Runner and 2nd gen Tacoma cover when a regear makes sense.
How Long Does a 1GR-FE Last?
250,000 miles is routinely reported on 1GR trucks with ordinary maintenance, and plenty of 4Runners and Tacomas are working well past that. The usual end-of-life signs are rising oil consumption and head gasket seepage, and because the block cannot be bored, a worn-out 1GR is usually replaced rather than rebuilt from the block up. Keep up with oil, keep the cooling system fresh, fix the timing cover leak if your truck has it, and this engine is very hard to kill.
1GR-FE Buyer's Checklist
- Which version? Confirm single or dual VVT-i from the year and model before you price parts.
- Front of the engine: oil on the passenger-side front of the engine on 2003–2007 4Runners and early 2007 FJs points to the timing cover leak.
- Coolant: check the level is at the line, the color is pink, and there is no oil or bubbles. Run a block test on high-mileage trucks.
- Cold start: listen for a loud tick that does not fade (lash on single VVT-i) or a rattle at startup (chain tensioner, rare).
- Codes: scan for stored P244x air injection codes on 2010+ 4Runner/FJ and 2012+ Tacoma.
- Records: spark plug changes at 30k intervals on single VVT-i trucks are a good sign the owner followed the real schedule.
Frequently Asked Questions
Is the 1GR-FE a reliable engine?
Yes. The 1GR-FE is one of Toyota's most durable V6 engines, with 250,000+ miles commonly reported. Its known weak points (an early front timing cover oil leak, occasional head gasket seepage at high mileage, and air injection pump failures on later trucks) are uncommon or fixable and do not usually end the engine's life.
Does the 1GR-FE have a timing belt or chain?
A timing chain. The 1GR uses a primary roller chain from the crankshaft to the intake cams and secondary chains between the intake and exhaust cams. There is no scheduled replacement interval.
What is the difference between single and dual VVT-i on the 1GR?
Single VVT-i engines (2003–2009 4Runner, all 2005–2015 Tacomas, 2007–2009 FJ) vary only the intake cam timing and use bucket lifters that need a valve lash check every 60,000 miles. Dual VVT-i engines (2010+ 4Runner and FJ) vary intake and exhaust timing, use roller rockers with hydraulic adjusters, have 10.4:1 compression and make 258–270 hp versus 236–245 hp.
Does the Tacoma 4.0 have dual VVT-i?
No. Every 2005–2015 Tacoma V6 is a single VVT-i 1GR-FE rated at 236 hp (245 hp on the 2005 rating). Only the 2010+ 4Runner and 2010–2014 FJ Cruiser received the dual VVT-i version in the US.
How often do you change spark plugs on a 1GR-FE?
It depends on the version. Single VVT-i engines use nickel plugs, and Toyota's maintenance guide for the 2008 Tacoma calls for replacement every 30,000 miles. Dual VVT-i engines use iridium plugs rated for 120,000 miles.
What causes P2440 on a 4Runner or FJ Cruiser?
P2440 and related P244x codes on 2010+ 4Runners and FJ Cruisers (and 2012+ Tacomas) point to the secondary air injection system, usually a stuck switching valve or a failed air pump after water intrusion. The truck may go into limp mode. The air injection warranty extension often mentioned online covers Tundra and Sequoia V8s, not the 1GR.
Can you bore out a 1GR-FE?
No. The 1GR has thin cast-in iron liners in an aluminum block, and they cannot be bored oversize. A badly damaged cylinder means a replacement block or short block.
How much horsepower does a supercharged 1GR-FE make?
The discontinued TRD supercharger is rated at 304 hp and 334 lb-ft on single VVT-i engines. Magnuson's MP90 is rated at about 305 hp and 335 lb-ft on single VVT-i Tacomas and FJs, and its TVS1320 kit for dual VVT-i 4Runners and FJs is rated at 335+ hp and 345+ lb-ft at about 6 psi.
Related Toyota Engine Guides
- Toyota 2UZ-FE 4.7 V8: Specs, Reliability & High Mileage Guide
- Toyota 5VZ-FE 3.4L V6: Full Specs, Common Issues & TRD Supercharger
- 2GR-FKS Possible Engine Problems
- Toyota 3RZ-FE Engine Guide
- Toyota 1FZ-FE Engine Guide
- Biggest Tires on a Stock FJ Cruiser: Fitment Guide
- Biggest Tires on a Stock 5th Gen 4Runner: Fitment Guide
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